Improvement in manufacture of dentists  pins



F. w; SMITH. Manufacture of Dentists Pins.

No. 34,616. Patented March 4,.1862.

mi a I & a? Am /W0? UNITED STATES PATENT OFFICE.

FRANCIS W. SMITH, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO S. S. WHITE, OF SAME PLACE.

IMPROVEMENT IN MANUFACTURE OF DENTISTS PINS.

Specification forming part of Letters Patent No. 34,616, dated March 4, 1862.

To all whom it may concern.-

Be it known that I, FRANCIS W. SMITH, of the city and county of Philadelphia, in the State of Pennsylvania, have invented a new and useful Improvement in Machinery for the Manufacture of Dentists and other Pins; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a plan of a machine with my improvement; Fig. 2, a central longitudinal vertical section of the same; Fig. 3, a face View of one of the dies; Fig. at, a central section of the pair of dies; and Figs. 5 and 6 are side views at right angles to each other of a pin made by the machine.

Similar letters of reference indicate corresponding parts in the several figures.

The principal object of this invention is to provide for the manufacture of pins with a head at each end suitable for artificial teeth manufactured according to the mode for which Letters Patent of the United States have been granted to S. S. White-that is to say, with heads at the outer ends of the pins; and it consists in a novel construction of dies for the manufacture of such two-headed pins.

To enable others to make and use my invention, I will proceed to describe its construction and operation.

The machine represented is, with the exception of the dies, the same as is commonly used in the manufactureof pins with single heads.

A is the bed-plate.

B is the main shaft carrying the cam C, for moving forward the feeding-nippers a b; cam D, for opening and closing the said nippers; cam E, for operating the plunger H, which carries the heading-punch b; cam F, for operating the upper cutter c, and cam G, for closing the heading=dies d e. The cam 0 open ates directly upon the bar J, of which the lower jaw of the nippers forms a part. The cam D effects its operation through a lever K. The cam E operates directly upon the plunger H and the cam F through a lever L, and the cam G operates through a sliding bar M and elbowlever N upon the lever O, which carries the upper die e. The lower die (1 is stationary, as is also the lower cutter f.

I suppose any further description of the machine beyond the dies and punch to be un=- necessary, as with the exception of these parts it is old and well known.

To explain the character of the dies and punch, I will first describe the two-headed pins to be made by the machine. These pins may have their heads of various forms; but one head must be of such form as can be produced by lateral compression of the wire in the dies. The head g, (see Figs. 5 and 6,) which is produced by the upsetting action of the punch b upon the end of the wire while the latter is gripped by the dies 01 6, may be of circular, elliptic, or other form, determined partly by the formof the cavity in the face of the punch and partly by the form of the ends of the dies which face the punch. This head is intended to be the outer one when the pin is inserted in the tooth in the manufacture of the latter, and to be received in the Vulcanite setting. The head h, which is produced entirely by the compression of the wire in the dies, may be of such various forms as can be produced by indenting the wire on opposite sides, and I prefer also to spread the wire at right angles to the indentations, as shown in Fig. 6, and the dies are formed at or near the ends farthest from the punch b, as shown at 1; in Figs. 3 and 4, to produce such indentation and spreading of the wire.

The operation of the several parts of the machine is the same as that of other pin-machines, the head h being formed by the ordinary closing movement of the dies d 8, pre paratory to the upsetting action of the punch. I will briefly explain this operation. The wire is introduced through the stationary holdingclamp l m, the guide n, and the cutters c f. The feeding movement of the nippers, which is regulated according to the length of the pin desired, brings the Wire into the open dies d e, and on the completion of that movement the upper die closes with sufficient force to produce the head it, after which and while the dies remain closed the arrangement relatively to the cutters c f and upper cutter 0 comes down and cuts. off the the punch b,substan-tia1ly as herein specified. pin, and the heading-punchb comes into operation to produce the head g. FRANCIS W. SMITH.

What I claim as my invention, and desire Witnesses: to secure by Letters Patent, is J NO. F. WALKER, The construction of the dies 0? e and their AQ. MUsTIN, Jr. 

